Shaft part angular positioning device and position method based on shaft end square groove

The invention relates to a shaft part angular positioning device based on a shaft end square groove. The shaft part angular positioning device comprises a drill jig body, a drill jig plate, a baffle and a screw. A central through hole is formed in the drill jig body, the central through hole is matched with a shaft part, the square groove is formed in one end of the central through hole, the square groove is perpendicular to the central through hole, and the square groove is eccentric relative to the central through hole; and the drill jig body is fixedly connected with the baffle through the screw, and the baffle 3 seals the other end of the central through hole. The shaft diameter and shaft end drilling machining of a machining shaft is completed in one-time positioning and clamping, and errors caused by multiple times of clamping are reduced. The device is more suitable for drilling with small shaft diameter and small hole diameter. A clamp is simple in structure, economical and convenient to use, and the